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Edison invented the light bulb many years ago（改为被动语态）
The light bulb__________ __________by Edison many years ago．
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更多 “ Edison invented the light bulb many years ago（改为被动语态）The light bulb__________ __________by Edison many years ago． ” 相关考题
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The Chinese people first _______ paper about 2 000 years ago.
A.discoveredB.foundC.experiencedD.invented
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We introduce ourselves () importers and exporters of light industrial (), having many years experience in this line of business.A、as,produceB、like,productsC、as,productsD、like,produce
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When replacing a thermostatic expansion valve sensing bulb, it is necessary toA.apply a light film of oil to increase heat transferB.apply a light film of oil to prevent oxidationC.apply a heavy coating of grease to function as a heat sinkD.carefully coat the device with silicone sealant to reduce the effects of convective cooling
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Modern handheld digital tachometers operated by counting light pulses returned to the unit byA.the tach generatorB.either the coupling or shaftC.a small bulb attached to the shaftD.a piece of reflective tape
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AMan invented a lot of sports equipment． The first true piece was the ball．Thousands of years ago，in Egypt，the children's favorite game was throwing stones． But a badly thrown stone could hurt a child． Looking for something less dangerous to throw，the peo-ple in Egypt made the first balls．At first，they used tree leaves to make balls． They used vines(藤) to keep the leaves to-gether． Later they began to use pieces of animals' skin and filled them with some light things．These balls were much better than the old ones．Before long they invented a lot of ball games，and each had its own rules． They began to play these ball games according to the rules． They thought that ball playing was one of the best ways to teach the young men to be brave and strong．( )21． The Egyptians invented _________very long ago．A． many different games with ballsB． throwing stonesC． dangerous gamesD． many different kinds of games
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How many life buoys________on board with self-igniting light?A.there existB.there isC.there areD.are there
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A light used to signal passing intentions must be an ______.A.all-round yellow light onlyB.all-round white light onlyC.all-round blue light onlyD.alternating red and yellow light
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An anchored vessel on pilotage duty must show which light(s) at night?A.A sternlight onlyB.Anchor lights onlyC.A white light over a red light onlyD.A white light over a red light and anchor lights
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A vessel trawling will display a ______.A.red light over a white lightB.green light over a white lightC.yellow light over a red lightD.white light over a green light
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共用题干
Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）, etc.5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.Paragraph 5______A: How Is the Nature of Light Explained Today?B: What Are Sources of Light?C: How Did Physicists Measure the Speed of Light?D: How Does Light Travel?E: How Did People Think of Light Years Ago?F: What Causes a Shadow?
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共用题干
Learn About Light1 Ancient civilizations were amazed by the existence of light for thousands of years?The Greek philoso- phrrs believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision.However,Empedocles and a Dutch scientist named Christian Huygens believed that light wag like a wave.According to them,light spread out and travelled like a straight line.This theory was acceptedduring the 19th century.2 In 1905,Albert Einstein published a research paper in which he explained what is referred to as the photoelectric effect.This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us tosee things around us.3 Things that give off light are known as sources of light.During the day,the primary source of light is the sun.Other sources of light include stars,flames,flashllights,street lamps and glowing gases in glass tube.4 When we draw the way light travels we always use straight lines.This is because normally light rays travel in a straight line.However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）,etc.5 Physicists have attempted to measure the speed of light since the early times.In 1849,Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel, number of wheel'S teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second.In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second.This is about a million times faster than the speed of an airplane.Objects are visible to the human eye as light is_______. A:sources of lightB:the speed of light C:the path of lightD:a straight lineE:a beam of lightF:a form of energy
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We’ve all heard of Thomas Edison,_______who invented the electric light and many otheA.man
B.a man
C.the man
D.men
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产生彩色投影必须调整下面哪个参数（）A、light的light transmission设为100%B、light的light transmission设为0%C、投影层的阴影层的light transmission设为80%D、接受阴影层的light transmission设为100%
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单选题What rhetoric device is used in the sentence Many hands make light work?A
Synecdoche.B
Simile.C
Metaphor.D
Oxymoron.
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单选题The color of the exhaust from a diesel engine should be （）A
clearB
hazy light brownC
hazy light blueD
hazy light grey
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多选题For Question 1, consider each of the choices separately and select all that apply. Which of the following statements about Edison can be inferred from the passage?AEdison was one of the world’s most esteemed and influential inventors.BConcrete furniture was the only one of Edison’s inventions to ultimately fail.CThe light bulb and the phonograph were extremely successful inventions by Edison.
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单选题A buoy marking a wreck will show a(n)（）.A
white light FL (2) and a topmark of 2 black spheresB
occulting green light and may be letteredC
yellow light and will be numberedD
continuous quick white light and may be numbered
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单选题An anchored vessel on pilotage duty must show which light(s) at night? （）A
A sternlight onlyB
Anchor lights onlyC
A white light over a red light onlyD
A white light over a red light and anchor lights
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单选题A vessel trawling will display a（）.A
red light over a white lightB
green light over a white lightC
yellow light over a red lightD
white light over a green light
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单选题A hollow-cathode lamp is（）A
A broad-band light sourceB
A narrow-band light sourceC
A light detectorD
Not a light source
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单选题打开锚灯！ （）A
Switch on the deck light!B
Switch on the anchor light!C
Switch on the cargo light!D
Switch on the hold light!
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单选题In accordance with SOLAS，the batteries that power interior lighting in inflatable liferafts can be made to last longer by（）.A
unscrewing the bulb during the daylightB
switching the light on only when necessaryC
taking no action as there is no way on saving powerD
taking no action as they shut off automatically in daylight
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单选题The distance from which a certain light is visible is directly proportional to the wattage of the light bulb. If the light is visible from 16 meters when a 40 watt bulb is used, from what distance is the light visible when a 75 watt bulb is used?A
30 metersB
35 metersC
51 metersD
89 metersE
91 meters
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单选题Which statement concerning Montauk Point Light is TRUE（）.A
The light comes on at sunsetB
There is an emergency light if the main light is extinguishedC
The height of the light is 24 feetD
The tower is painted with black and white stripes
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单选题How many life buoys（）on board with self-igniting light?A
there existB
there isC
there areD
are there
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单选题An alternating light（）.A
shows a light with varying lengths of the lighted periodB
shows a light that changes colorC
marks an alternate lesser-used channelD
is used as a replacement for another light
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单选题The inside light in an inflatable liferaft is turned on（）.A
automatically as the liferaft inflatesB
with a switch near the boarding handleC
at night because the light has a photosensitive switchD
by screwing the bulb in after the raft is inflated
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